We make every effort to ensure the data presented here is accurate based on the best available information currently on file with DEC. It is therefore subject to change as new information becomes available. We recommend contacting the assigned project staff prior to making decisions based on this information.

Problems/Comments

The Alaska Department of Transportation and Public Facilities (ADOT&PF) Homer Maintenance Station, constructed in 1984, included one Class V injection well connected to a floor drain system with an oil water separator. In December 2015, as part of a compliance order with EPA, three soil borings were advanced for characterization. A soil sample collected from a boring at the assumed point of discharge at a depth of 1.5 feet below ground surface, which had hydrocarbon odor and black appearance, contained 1,1,2-trichloroethane up to 0.0422 mg/kg which is above the 2008 ADEC migration to groundwater cleanup level of 0.018 mg/kg. Additionally, the other borings contained detectable concentrations of contaminants with elevated limits of quantitation (LOQ) above ADEC cleanup levels.

Action Information

Action Date

Action

Description

DEC Staff

3/15/2016

Update or Other Action

ADEC received the Homer Class V Injection Well Closure Report submitted by R&M and dated March 2016. Soil sample results from this injection well contain contamination above ADEC method two cleanup levels and extent of contamination has not been determined. A soil sample collected from boring HMR16-DP at a depth of 1.5 to 2.5 feet below ground surface, which had hydrocarbon odor and black appearance, contained 1,1,2-trichloroethane up to 0.0422 milligrams per kilogram (mg/kg) which is above the 2008 ADEC migration to groundwater cleanup level of 0.018 mg/kg. Second, multiple contaminants were detected above the ADEC 2016 updated cleanup levels which include 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene and TCE. Third, multiple analytes contain elevated limits of quantitation (LOQ) above ADEC 2008 and 2016 cleanup levels (i.e. qualitatively estimated with a J flag).

On this date, EPA sent the Approval of Closure Plan for One Motor Vehicle Waste Disposal Well at ADOT&PF Homer Highway Maintenance Station.

Grant Lidren

8/2/2016

Report or Workplan Review - Other

ADEC received the Homer Maintenance Station Retention Pond Installation Field Screening Activities Report dated August 2 submitted by RSE (note: ADEC did not approve the work plan). Activities included installation of a lift station adjacent to maintenance shop, 265 linear feet of buried arctic drain pipe, and construction of a drainage retention pond at the UIC location. During activities, pid field screen samples were collected during the excavations and from the stockpiles. At the lift station, PID results were up to 76.6 ppmv from a sample collected 5 feet bgs. At the arctic drain pipe first 110 linear feet north of lift station, soil had a hydrocarbon odor with PID results up to 2,713 ppmv from a sample collected 4 feet bgs. Screening samples collected for the rest of the 155 linear feet leading to the retention pond (starting 20 feet north of the pavement break) had pid results up to 6.5 ppmv at 3 feet bgs. At the retention pond, PID results were up to 5.9 ppmv. Approximately 60 cy of suspected contaminated soil was stored on a 20 mil liner onsite from excavation activites. Soil that was deemed suitable for reuse (based off pid readings) was put back in the excavations.

Grant Lidren

11/4/2016

Site Characterization Workplan Approved

The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the ADOT&PF Homer M&O Station UIC Closure Work Plan submitted by Restoration Science & Engineering (RSE) dated November 2016. ADEC has no objections to this work plan and RSE may proceed.

Grant Lidren

11/7/2016

Report or Workplan Review - Other

The Alaska Department of Environmental Conservation (ADEC) Contaminated Sites Program (CSP) has received and reviewed the Homer Maintenance & Operations Station Retention Pond Installation Stockpile Soil Sampling Work Plan submitted by Restoration Science & Engineering (RSE) dated November 4,2016. ADEC has no objections to the work plan and RSE may proceed.

Grant Lidren

1/3/2017

Report or Workplan Review - Other

ADEC received a Report with this date titled: Homer Maint. and Operations Station Retention Pond Installation Stockpile Soil Sampling Characterization Report submitted by RSE. Four soil samples collected 1 to 1.5 feet into the 60 cy retention pond installation stockpile contained contaminant concentration above method two cleanup levels including: DRO up to 854 mg/kg, benzene up to 25.3 ug/kg, ethylbenzene up to 386 ug/kg, xylenes up to 2,270 ug/kg, 1,2,4-trimethylbenzene up to 1,320 ug/kg, naphthalene up to 264 ug/kg, and 1-methylnapthalene up to 1.03 mg/kg.

Grant Lidren

3/3/2017

Site Characterization Report Approved

On this date, ADEC received the ADOT&PF Homer M&O Station UIC Removal & Characterization Report, Rev. 1 submitted by RSE and dated March 2017. 480 cy of presumed clean soil was segregated from 110 cy of presumed dirty soil during closure of the mounded soil absorption system (SAS). A total of 19 soil samples were collected from the excavation sidewalls and bottom. Two soil samples collected from the west sidewall at 4 feet bgs contained DRO up to 1,290 mg/kg (note: the excavation was limited by the DOT security fence to the west). A soil sample collected from the excavation bottom at 6 feet bgs contained PCE up to 0.432 mg/kg. The rest of the soil samples collected from the excavation sidewall and bottom were below method two cleanup levels, however, the detection limit for some analytes were above ADEC cleanup levels. Soil samples collected from the 480 cy presumed clean stockpile did not contain contaminant concentrations above method two cleanup levels. Soil samples collected from the 110 cy presumed dirty stockpile contained trichloroethene (TCE) up to 0.137 mg/kg, diesel range organics up to 1,750 mg/kg, naphthalene up to 0.150 mg/kg, and 1,2,4-trimethylbenzene up to 0.472 mg/kg.

On this date, ADEC approved the transport of the 480 cy uncontaminated stockpile to 3425 Sterling Highway. this soil will be used as fill 1 to 2 feet deep and capped with a thick layer of gravel and compacted. This work will be conducted early summer 2017.

Grant Lidren

4/10/2017

Offsite Soil or Groundwater Disposal Approved

On this date, DOT completed transport of the 480 cy uncontaminated stockpile to 3425 Sterling Highway.

Grant Lidren

6/14/2017

Offsite Soil or Groundwater Disposal Approved

On this date, ADEC approved the transport of 60 cy stockpile was removed along 265 linear feet from the lift station, arctic drain pipe trench, and retention pond area. This soil soil will be transported to the Columbia Ridge Landfill in Oregon. Contaminants of Concern include: Diesel range organics, Benzene, Ethylbenzene, xylenes, 1,2,4-trimethylbenzene, 1-methylnapthalene, and Naphthalene. (Note: this contaminated soil was also from the site known as 2314.26.002 ADOT&PF Homer Facility. Additionally, some of the contaminated soil encountered along the arctic drain pipe trench may be from a new unknown source area).

Grant Lidren

6/14/2017

Offsite Soil or Groundwater Disposal Approved

On this date, ADEC approved the transport of a 210 cy stockpile removed from the leach field/ class V well discharge point. This soil was transported to the Columbia Ridge Landfill in Oregon (received on August 17, 2017). Contaminants of Concern include: trichloroethene (TCE), Diesel range organics, Naphthalene, and 1,2,4-trimethylbenzene.

Grant Lidren

Contaminant Information

Name

Level Description

Media

Comments

Control Type

Type

Details

Requirements

Description

Details

There are no documents for this site report.

Missing Location Data

Because the GIS location data for this site has not been entered, we cannot direct you to its position on the map. Click "Continue" to proceed to the Contaminated Sites Web Map or "Close" to return to the site report.